As the title says, I think that I came across a bug or limited functionality.
Most of my TV episodes and movies are in H.265 (8 and 10 bit) and some of them came with PGS subtitles. Whenever I play those files via the Web Player in Chrome, Firefox, Edge, Chrome on Android, etc., the video plays for about 30 seconds, then it buffers for 5-10, and this process repeats for the entire duration. I do not have similar problem with SRT subtitles. Does anyone know a way around this, or if anyone else is experiencing the same problem?
I have a QNAP TS-453mini and the CPU is around 30% when transcoding a video (10bit) as described above, and the usage does not significantly change when the buffering occurs.